Phase-microstructure-property relationship in high quality factor MgO-Al 2 O 3 -SiO 2 -TiO 2 -La 2 O 3  glass-ceramics

Wang, Huijuan; Zscheckel, Tilman; Lin, Huixing; Li, Botao; Rüssel, Christian; Luo, Lan

doi:10.1016/j.ceramint.2017.02.137

Cited by 10 publications

(10 citation statements)

References 39 publications

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“…(21) The crystalline phase in the glass matrix can restrain cracks by blunting the crack tips, or by other mechanisms. (26)(27)(28) Our experimental results indicate that the ring cracks of borosilicate glass are much less pronounced than those of fused silica due to the amorphous droplet phase. Therefore, not only the crystalline phase, but also the amorphous droplet phase in the glass matrix could restrain cracks.…”

Section: Discussionmentioning

confidence: 69%

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Indentation cracking behaviour and structures of nanophase separation of glasses

Cheng¹,

Song²,

Ercius³

et al. 2017

Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B

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Section: Discussionmentioning

confidence: 69%

“…Many studies have shown that the size, shape and density of the crystalline phase influence the detailed cracking behaviour of glassceramics. (27,28) It would be expected that the cracking behaviour of the glasses with a droplet nanophase separation would also further be influenced by the size and density of the droplets.…”

Section: Discussionmentioning

confidence: 99%

Indentation cracking behaviour and structures of nanophase separation of glasses

Cheng¹,

Song²,

Ercius³

et al. 2017

Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B

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“…The microwave dielectric materials can be used in many fields, such as antennas, duplexers, resonators and filters. [1][2][3] High performance materials for millimeter-wave communication should have a low dielectric constant (ɛ r ), high quality factor (Qf), near-zero temperature coefficient of resonance frequency (τ f ) and relatively low sintering temperature. [4][5][6][7] The low ɛ r value can reduce the signal delay, high Qf value can achieve the better selectivity, and the nearzero τ f value can improve stability.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the microwave dielectric ceramics are indispensable materials in millimeter‐wave and even extending to THz band systems. The microwave dielectric materials can be used in many fields, such as antennas, duplexers, resonators and filters [1–3] . High performance materials for millimeter‐wave communication should have a low dielectric constant (ϵ r ), high quality factor (Qf), near‐zero temperature coefficient of resonance frequency (τ f ) and relatively low sintering temperature [4–7] .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Microwave Dielectric Properties in Mg₂Al₄Si₅O₁₈ Through Cu²⁺ Substitution

et al. 2021

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The Mg 2 Al 4 Si 5 O 18 ceramic is considered as a kind of important candidates for millimeter-wave applications. In this work, Mg 2x Cu x Al 4 Si 5 O 18 (0 � x � 0.16) ceramics were synthesized by solidstate reaction, aiming to improve the microwave dielectric properties. According to the X-ray powder diffraction (XRD) analysis, Cu 2 + ions enter into the Mg 2 Al 4 Si 5 O 18 lattice and form a solid solution. The dense microstructure was observed in the Cu-substituted Mg 2 Al 4 Si 5 O 18 ceramics at x = 0.04 sintered at 1420°C. The dielectric constant (ɛ r ) values depend on the microstructure, secondary phase and ionic polarizability of the samples. The quality factor (Qf) values are dominated by the microstructure, secondary phase and centro-symmetry of [Si 4 Al 2 ] hexagonal ring. The temperature coefficients of resonance frequency (τ f ) are strongly related to the Mg/CuÀ O bond valance. In comparison to pure Mg 2 Al 4 Si 5 O 18 ceramics, the excellent microwave dielectric properties with ɛ r = 4.56, Qf = 31,100 GHz and τ f = À 52 ppm/°C were obtained at x = 0.04 with sintering at 1420°C. Thus, the Mg 2-x Cu x Al 4 Si 5 O 18 (0 � x � 0.16) ceramics will be promising millimeter-wave communication materials.

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“…Lithium aluminosilicate (Li 2 O-Al 2 O 3 -SiO 2 , LAS) is a wellknown low coefficient of thermal expansion (CTE) glassceramic which are beneficial for rapid temperature change and high-temperature applications such as low temperature co-fired ceramics (LTCC), electronic packaging, nuclear waste storage, sealant materials and cooktop panel [1][2][3][4][5][6]. Due to the remarkable properties of thermal stability, LAS glass ceramics have been developed to satisfy the application of rapid temperature changes.…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering treatment time on the sintering behaviour and thermal shock resistance of Li₂O-Al₂O₃-SiO₂ glass-ceramics

Lutpi

Mohamad

Abdullah

2021

Journal of Asian Ceramic Societies

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In order to determine the correlation of flexural strength and thermal shock resistance properties, the sintering behavior of Li 2 O-Al 2 O 3 -SiO 2 (LAS) glass-ceramics at different sintering treatment times and the effect of thermal shock cycles on LAS glass-ceramics were investigated. The LAS glass-ceramics were isothermally treated at 1100°C from 1.5 to 4.5 h. Phase transformation of major crystalline of β-spodumene and minor crystalline of ZrTiO 4 revealed unchanged as sintering treatment time increased. The physical properties of LAS glass-ceramics that were sintered for 3.5 h demonstrated an increased density (2.45 g/cm 3 ) and less porosity percentage (0.62%). The prolonged sintering treatment affected the microstructure whereby the mean grain size increased from 0.55 to 0.67 µm which also demonstrated the increase of microhardness in the range between 3.90 and 5.47 GPa. The flexural strength of LAS glass-ceramics revealed an enhancement of 158 MPa when sintered for 3.5 h. The thermal shock resistance properties were assessed at 500°C from one to seven cycles via thermal shock tests. After four thermal shock cycles, LAS glass-ceramics showed an improvement of 82% of residual strength from its original strength, due to a decrease in the formation of pores and an increase in the crystallinity and percentage of β-spodumene.

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Phase-microstructure-property relationship in high quality factor MgO-Al 2 O 3 -SiO 2 -TiO 2 -La 2 O 3 glass-ceramics

Cited by 10 publications

References 39 publications

Indentation cracking behaviour and structures of nanophase separation of glasses

Indentation cracking behaviour and structures of nanophase separation of glasses

Enhanced Microwave Dielectric Properties in Mg₂Al₄Si₅O₁₈ Through Cu²⁺ Substitution

Effect of sintering treatment time on the sintering behaviour and thermal shock resistance of Li₂O-Al₂O₃-SiO₂ glass-ceramics

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Phase-microstructure-property relationship in high quality factor MgO-Al 2 O 3 -SiO 2 -TiO 2 -La 2 O 3 glass-ceramics

Cited by 10 publications

References 39 publications

Indentation cracking behaviour and structures of nanophase separation of glasses

Indentation cracking behaviour and structures of nanophase separation of glasses

Enhanced Microwave Dielectric Properties in Mg2Al4Si5O18 Through Cu2+ Substitution

­Effect of sintering treatment time on the sintering behaviour and thermal shock resistance of Li2O-Al2O3-SiO2 glass-ceramics

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Product

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About

Enhanced Microwave Dielectric Properties in Mg₂Al₄Si₅O₁₈ Through Cu²⁺ Substitution

Effect of sintering treatment time on the sintering behaviour and thermal shock resistance of Li₂O-Al₂O₃-SiO₂ glass-ceramics